From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Analysis of Pierce engine efficiency, focusing on power output, crankshaft balancing, and camshaft drive.
| Identifier | ExFiles\Box 173\1\ img173 | |
| Date | 4th February 1934 | |
| -6- IM/R.D/ST.4.2.34. Pierce Engine Efficiency. They are getting about 180 B.H.P. out of 460 cu.ins., not a bad power output compared with the Phantom in considering that they are a side valve engine. Crankshaft only 70% balanced (no big end balanced, 70% of pin and webs only). They have a camshaft period which they say rattles the valve gear and which they can alter with the crankshaft damper. Seems to be due to - (1) Having a rubber type crank damper which we know is not 100% efficient. (2) No spring drive to camshaft but a short chain only. Hs{Lord Ernest Hives - Chair}/ita. | ||